MS1003SH datasheet(14/41 Pages) SHINDENGEN

14 / 41 page

MS1003SH･MS1004SH

Application Note Ver.2.2

SHINDENGEN ELECTRIC MFG. CO. , LTD

14/41

3) Switching from super standby mode to normal mode

The IC exits super standby mode by clamping the Z/C pin voltage at 3 V or less using an external signal.

3.4 Protection functions

3.4.1 Vcc overvoltage protection latch

The MS1003SH and MS1004SH incorporate an overvoltage protection circuit (OVP).

The IC is latched when the control coil voltage exceeds the VOVP to provide indirect overvoltage

protection for the secondary output. The IC is unlatched by momentarily dropping the VCC pin voltage to

the VUL (unlatch voltage) or below.

Vin

Nc巻線

ﾊﾞｯｸｱｯﾌﾟ

Vcc

VccUVLO

起動

UVLO

Vcc(start)=12V

Vcc(stop on stby)

or Vcc(stop on normal)

VUL=3.2V

ﾗｯﾁ

VUL信号

あり

なし

ラッチ停止

ラッチ解除

出力検出ｵｰﾌﾟﾝ等

わざとVCC電圧上昇

なし

あり

ラッチ解除

VOVP=26V

3.4.2 Overcurrent protection

A current detection resistor is connected between the

OCL pin and the GND pin to detect the source current

of the main switching device. The main switching

device current is limited by pulse-by-pulse operation

using a threshold voltage that varies with ON range.

Vin端子

GND端子

OCL端子

電流検出

抵抗

Latched

OFF

Nc coil

backup

OFF

Startup

UVLO

Deliberately increasing

Vcc voltage (e.g., output

detection open)

Latch

Unlatched

VUL signal

Unlatched

GND pin

OCL pin

Vin pin

Current

detection

resistor

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